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Assessing cloud spatial and vertical distribution with Cloud Infrared Radiometer CIR-7

dc.contributor.authorGenkova, I.
dc.contributor.authorLong, C.
dc.contributor.authorBesnard, T.
dc.contributor.authorGillotay, D.
dc.date2004
dc.date.accessioned2017-04-20T12:52:30Z
dc.date.available2017-04-20T12:52:30Z
dc.identifier.urihttps://orfeo.belnet.be/handle/internal/5080
dc.descriptionRecently developed, the Cloud Infrared Radiometer CIR-7, operates 7 infrared sensors, each with a 6-degree field of view, and spectral range 8-14 μm. The sensors are mounted on a semi-circular band at angles 0, 12, 24, 36, 48, 60 and 72°. A "hemisphericalα mosaic of 181 brightness temperature measurements centered on the zenith is obtained by the rotation of the band around the vertical axis, performing 30 scans, every 12° from 0α (North) to 348α. We present an algorithm that utilizes the brightness temperatures from the CIR-7 given the precipitable water vapor amounts and vertical profiles of the thermodynamic state of the atmosphere from independent measurements. It estimates the total cloud amount, the amount of low, middle and high clouds, maps out the spatial distribution of the cloud field and determines the vertical distribution of the clouds by computing cloud base heights. The algorithm is validated through comparisons with well studied ground-based and satellite retrieval techniques. Initial analyses show good cloud amount assessment and spatial mapping abilities. The estimated mean absolute cloud amount difference for day time is 12.3% when compared to the amount of opaque clouds derived with a total sky imager (TSI). For night time, this difference is 19.4% comparing to the effective cloud fraction derived with an atmospheric emitted radiance interferometer (AERI). The vertical distribution understanding is currently limited; however, the amounts of low, middle and high clouds could be determined and studied further.
dc.languageeng
dc.titleAssessing cloud spatial and vertical distribution with Cloud Infrared Radiometer CIR-7
dc.typeConference
dc.subject.frascatiPhysical sciences
dc.audienceScientific
dc.subject.freeAlgorithms
dc.subject.freeClouds
dc.subject.freeImage sensors
dc.subject.freeInfrared devices
dc.subject.freeInterferometers
dc.subject.freePrecipitation (meteorology)
dc.subject.freeRemote sensing
dc.subject.freeSatellites
dc.subject.freeSensors
dc.subject.freeCloud amount
dc.subject.freeCloud map
dc.subject.freeGround-based retrieval techniques
dc.subject.freeVertical cloud distribution
dc.subject.freeRadiometers
dc.source.titleProceedings of SPIE 5571, Remote Sensing of Clouds and the Atmosphere IX
dc.source.volume5571
dc.source.pageA1
Orfeo.peerreviewedNo
dc.identifier.doi10.1117/12.564234
dc.identifier.scopus2-s2.0-15944404270
dc.source.editorComeron, A.
dc.source.editorCarleer, M.R.
dc.source.editorPicard, R.H.
dc.source.editorSifakis, N.I.


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